[U-Boot-Users] [PATCH] changes to IDE driver for LSB machines

Wolfgang Denk wd at denx.de
Thu Aug 14 21:54:41 CEST 2003

In message <20030814183104.GA23820 at buici.com> you wrote:
> Aside from the ARM additions, there are changes to allow the IDE code
> to run on other little endian machines IA32, mips.
> BTW, the macro names, WORDS_BIGENDIAN and BYTES_BIGENDIAN come from
> autoconf.

Maybe. But we don't use autoconf in U-Boot. I don;t  like  to  invent
new  macro  names  if  there is a working mechanism in place already.
Please use <include/asm/byteorder.h>".

> Also, the endianness of mips isn't clear.  Like PPC, it can do either
> and as far as I can tell both are supported by Debian.

This is why I do not want to base such  stuff  on  the  name  of  the
architecture.  There  is a generic way to solve this issue, so please
let's use this.

> +* Patch by Marc Singer, 14 Aug 2003
> +  - New target, Sharp KEV7A400
> +  - New configuration method using mkconfigx script
> +  - IDE drivers changes to support little endian CPUs.

Please separate the new board support from the  changes  to  the  IDE

BTW: I don't see any new board support stuff in this patch???

> +input_data(int dev, ulong *sect_buf, int words)
> +{
> +	volatile u32* p = (volatile void*)(ATA_CURR_BASE (dev));
> +	u16* rg = (void*) sect_buf;
> +	while (words--)
> +	  *rg++ = (*p)&0xffff;
> +
> +	  //	insw(ATA_DATA_REG, sect_buf, words << 1);

Please don't use C++ comments.

>  {
> -	int start,end;
> +#if !defined (BYTES_BIGENDIAN) || defined (__PPC__)

I quote yourself::

        "Also, the endianness of mips isn't clear. Like PPC, it can
        do either..."

And here you base an assumption  on  the  architecture  name?  Please
decide what you want.

And below you add BYTES_BIGENDIAN for  PPC  systems,  so  this  makes
really little sense to me.


This just pollutes the namespace and is 100%  redundand.  Please  use
the existent macros.

Patch rejected.

Best regards,

Wolfgang Denk

Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
By the way, ALL software projects are done by iterative  prototyping.
Some companies call their prototypes "releases", that's all.

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